fall upon vs metre

fall upon

verb
  • to occur at some particular point in time. 

  • to experience; to suffer. 

  • to set upon; to attack suddenly 

metre

verb
  • To put into metrical form. 

noun
  • The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to 39+⁴⁷⁄₁₂₇ (approximately 39.37) imperial inches. 

  • The rhythm or measure in verse and musical composition. 

How often have the words fall upon and metre occurred in a corpus of books? (source: Google Ngram Viewer )